CN201236687Y

CN201236687Y - Renewedly entrance guiding device for injection string and feeding-discharging tool

Info

Publication number: CN201236687Y
Application number: CNU2008201086851U
Authority: CN
Inventors: 姜伟; 刘义刚; 张健; 付英军; 牛海峰
Original assignee: China National Offshore Oil Corp CNOOC; CNOOC Research Center
Current assignee: China National Offshore Oil Corp CNOOC; CNOOC Research Center
Priority date: 2008-06-06
Filing date: 2008-06-06
Publication date: 2009-05-13
Anticipated expiration: 2018-06-06

Abstract

The utility model relates to a guiding device for re-entry of an injection pipe column and a feed-in/pull-out tool thereof. The guiding device is characterized in that the guiding device comprises a cylindrical base; a through hole is formed longitudinally at the center of the base; a conical guiding hole is formed at the upper part of the through hole; a pair of screw thread holes communicated with the through hole is symmetrically arranged in the radial direction at the middle part of the base; a circle of annular groove is formed on the inner wall of the through hole at the lower part of the base; two cylindrical pins are arranged corresponding to the two screw thread holes, wherein, one end of the pin is provided with external threads, and the other end thereof is provided with a relatively thinner polished rod; and a screwdriver insertion port is formed at the end parts of the ends of the pins which are provided with the external threads. The utility model also provides a specialized feed-in/pull-out tool for the guiding device in order to greatly facilitate the feed-in and the pull-out of the guiding device. If the utility model is arranged above a top part sand control packer, the difficult problem with the insertion of the injection pipe column can be solved properly. The utility model can be widely applied to the process of offshore oil exploitation.

Description

A kind of injection string reenters guiding device and sends into the taking-up instrument

Technical field

The utility model relates to a kind of guiding device and sends into the taking-up instrument, particularly reenters guiding device and sends into the taking-up instrument about a kind of offshore oilfield injection string.

Background technology

Offshore oilfield adopts the method for the injection of polymer displacement of reservoir oil to solve for improving the extraction efficient in existing oil field usually, thereby reaches the purpose of final raising recovery ratio and raising field output.Offshore oilfield is in the work of implementing polymer displacement of reservoir oil raising recovery ratio, usually the problem that runs into is: injection well (as shown in Figure 1) originally is owing to have sand control packer 20 and big section sand control pipe 30 in the pit shaft 10, when injection of polymer, can not pull out the position of these sand control pipes 30 and change packer 20, therefore, if insert the injection string 40 of multi-zone flow regulating once more, particularly in inclined shaft, tubing string is difficult to centering, and it is very big to insert difficulty smoothly.

Summary of the invention

At the problems referred to above, the purpose of this utility model provides a kind of offshore oilfield injection string and reenters guiding device and send into the taking-up instrument.

For achieving the above object, the utility model is taked following technical scheme: a kind of injection string reenters guiding device, it is characterized in that: it comprises a cylindric base, described base central longitudinal is to a through hole is set, described through hole top is the targeting port of a band tapering, described base middle part radial symmetric is provided with the screwed hole of the described through hole of a pair of perforation, the through-hole wall of the bottom of described base is provided with a ring annular groove, correspondingly with described two screwed holes be provided with two one ends and have external screw thread, the other end has the cylindrical peg of thin polished rod, and described pin has an externally threaded end end one screwdriver insertion mouth is set.

Corresponding with the position of described annular groove, be provided with a pair of radial hole in the radial symmetric of described base.

A kind of injection string reenters the taking-up instrument of sending into of guiding device, and it is characterized in that: it comprises a tool spindle, an overcoat and some auxiliaries; Described tool spindle is made up of an apical axis, two axis and a lower shaft of connecting by taper thread successively; Described apical axis is provided with the internal thread interface of a band tapering that is connected with drilling rod, described two axis tops are respectively arranged with a circle flange step, described lower shaft middle part is provided with a radial direction through hole, the bottom radial symmetric of described lower shaft is provided with a pair of blind hole, and the diameter of described apical axis and lower shaft is greater than two axis; Described overcoat is by forming by upward cover core, the body that is threaded and the core of trapping, and described body outer setting has the guide table of band tapering; Described auxiliary comprises that two are arranged on the two described axis, and the back-moving spring between two described cover cores and body, two latchings that are arranged on little spring in described two blind holes and two band cup heads, and two passed two described latchings and be connected two end caps on the described blind hole.

The utility model is owing to take above technical scheme, it has the following advantages: 1, guiding device of the present utility model is owing to adopted a base that has targeting port, and through hole is set at the center of base, therefore when injection string reenters the top sand control packer, when the targeting port on base top can make injection string very convenient the insert in the through hole of guiding device, and enter sand control packer and big section sand control pipe smoothly, solved a difficult problem of in the sand control packer of top, inserting the injection string operational difficulty again.2, guiding device of the present utility model is sent into the taking-up instrument because the corresponding pin that is provided with radial direction through hole and has polished end with guiding device, therefore guiding device can be set in the lower shaft outside of sending into the taking-up instrument, and fix with pin, after by instrument guiding device being delivered to the position then, take out instrument by the polished rod on the pressure cut off pin again.3, the taking-up instrument sent into by guiding device of the present utility model because the corresponding a pair of blind hole of radial symmetric and little spring and two latchings of being with cup heads corresponding with the blind hole internal diameter of being provided with guiding device, therefore after guiding device being sent into the lower shaft insertion guiding device of taking-up instrument, when the latching of two band cup heads arrives the annular groove of guiding device bottom setting, under the elastic force effect of little spring, the latching of two band cup heads springs into annular groove, the guiding device base is blocked, carry guiding device then and send into the taking-up instrument, guiding device will together be extracted out.

Description of drawings

Fig. 1 is installation site, a utility model guiding device down-hole schematic diagram

Fig. 2 is the utility model guiding device structural representation

Fig. 3 is a pin configuration schematic diagram in the utility model guiding device

Fig. 4 is that the utility model is sent into taking-up tool construction schematic diagram

Fig. 5 is the utility model tool spindle schematic diagram

Fig. 6 is the utility model tool spindle overcoat schematic diagram

Fig. 7 is the utility model guiding device running tool scheme of installation

Fig. 8 is that the utility model guiding device takes out the instrument scheme of installation

The specific embodiment

Below in conjunction with drawings and Examples, the utility model is described in detail.

As Fig. 2, shown in Figure 3, the utility model guiding device comprises: a cylindric base 1, to a through hole 11 is set, the top of through hole 11 is provided with the targeting port 12 of a band tapering in the central longitudinal of base 1.The outside dimension of base 1 pit shaft 10 internal diameter sizes poly-with implementing notes are slidingly matched, and through hole 11 diameters of base 1 are corresponding with the internal diameter size of top sand control packer 20.Radial symmetric is provided with a pair of screwed hole 13 in the both sides, middle part of base 1, and a ring annular groove 14 is set in the bottom of base 1.Correspondingly with two screwed holes 13 be provided with two and have externally threaded cylindrical peg 2, after two pins 2 were screwed into screwed hole 13, an end that is arranged in through hole 11 inserted mouthfuls 22 for the outer end of thinner polished rod 21, two pins 2 has screwdriver, inserting mouth 22 can be cross, also can be yi word pattern.

As Fig. 4, shown in Figure 5, the taking-up instrument of sending into of the utility model guiding device comprises a cylindrical tool axle 3, an overcoat 4 and auxiliary 5.Tool spindle 3 is made up of an apical axis connecting by taper thread successively 31, two 32,33 and lower shafts 34 of axis.The top of apical axis 31 is provided with the internal thread interface 35 of a band tapering, is used to connect drill string, is respectively arranged with a circle flange step 36 on two axis, 32,33 tops.The diameter of apical axis 31 and lower shaft 34 is provided with a radial direction through hole 37 greater than two axis at lower shaft 34 middle parts, and radial symmetric is provided with a pair of blind hole 38 in the both sides, bottom of lower shaft 34.

As Fig. 4, shown in Figure 6, overcoat 4 is made up of last cover core 41, body 42 and the core 43 of trapping, on overlap core 41, body 42 and the core 43 of trapping each other by being threaded, body 42 outer setting have the guide table 44 of band tapering, to avoid when inserting guiding device, running into the targeting port 12 on the base 1.Auxiliary 5 comprises latching 53 and two end caps 54 of 51, two little springs corresponding with blind hole 38 internal diameters of two back-moving springs corresponding with

axis

32,33 diameters 52, two band cup heads.

As shown in Figure 4, earlier a back-moving spring 51 will be overlapped respectively on two

axis

32,33 during installation, again two

axis

32,33 are linked into an integrated entity, then body 42 is sleeved on the junction of two

axis

32,33, again upper and

lower cover core

41,43 is fixedly connected on the upper and lower end of body 42 respectively by screw thread, so that two back-moving springs 51 are limited in the upper and lower cover core 41,43.And then with apical axis 31 and lower shaft 34 respectively by being threaded on two

axis

32,33, the taking-up instrument of sending into of guiding device has just been finished assembling substantially.

As shown in Figure 7, when the utility model guiding device is installed and used, may further comprise the steps:

1, the lower shaft 34 that at first will send into taking-up instrument lower end inserts in the through hole 11 of guiding device base 1, the screwed hole 13 that the radial direction through hole 37 on the lower shaft 34 is aimed on the base 1;

2, two pins 2 with guiding device are screwed into from two outsides of screwed hole 13 respectively, make two polished rods 21 of two pins 2 lean out screwed hole 13 the inners, are positioned at the radial direction through hole 37 of lower shaft 34;

3, the apical axis 31 that will send into the taking-up instrument is connected on the drilling rod, and will send into taking-up instrument and whole guiding device by drilling rod and send into together in the pit shaft 30 of preparing to implement polymer displacement of reservoir oil (as shown in Figure 1);

4, by drilling rod tool spindle 3 is applied downward pressure at well head, when the pressure of tool spindle 3 reached the pressure that pin 2 cut off, polished rod 21 places of pin 2 between screwed hole 13 and radial direction through hole 37 were cut off;

5, two springs 51 and two flange steps 36 all can stop tool spindle to continue to move downward, therefore the well head place can be according to the instantaneous variation of pressure (during cut-out, resistance reduces quickly, and rise) stop to exert pressure, when carrying on the drilling rod, reset for spring 51 drives tool spindle 3, the whole taking-up instrument of sending into is removed, and guiding device is in place;

6, can insert the injection string 40 of multi-zone flow regulating once more by the guide effect of guiding device this moment, finish the utility model purpose.

As shown in Figure 8, when if desired guiding device being taken out, the concrete taking-up may further comprise the steps:

1, in two blind holes 38 of lower shaft 34 bottoms of sending into the taking-up instrument, puts into the latching 53 of little spring 52 and two band cup heads respectively, and fixedly two end cap 54 (such as by being threaded, but be not limited thereto) in the end of two blind holes 38, prevent that latching 53 from being ejected by little spring 52;

2, the apical axis 31 that will send into the taking-up instrument is connected on the drilling rod, the tool spindle 3 that to send into the taking-up instrument by drilling rod inserts in the through hole 11 of guiding device base 1, in this process, two latchings 53 are compressed in two blind holes 38 that enter lower shaft 34 under targeting port 12 conical surface effects of guiding device;

3, tool spindle 3 continues to move downward, and when latching 53 arrived annular grooves 14, under the elastic force effect of little spring 52, the latching 53 of two band cup heads just can spring in the annular groove 14 of guiding device, and the base 1 of guiding device is blocked;

4, upwards mention drilling rod, guiding device is extracted by the tool spindle 3 that connects on it.

If desired the utility model is fully reused, two radial holes 15 need be set on the position of guiding device with respect to annular groove 14, to withstand two latchings 53 by instruments such as screwdrivers, to send into the taking-up instrument takes out from guiding device, again two end caps 54, latching 53 and spring 52 are taken out from blind hole 38, take out with will the break pin 2 of polished rod 21 of screwdriver, change two new pins 2, just can and send into the taking-up instrument and reclaim, reuse guiding device of the present utility model.

The utility model guiding device and send into and the taking-up instrument all can adopt the high strength alloy steel material.

Claims

1, a kind of injection string reenters guiding device, it is characterized in that: it comprises a cylindric base, described base central longitudinal is to a through hole is set, described through hole top is the targeting port of a band tapering, described base middle part radial symmetric is provided with the screwed hole of the described through hole of a pair of perforation, the through-hole wall of the bottom of described base is provided with a ring annular groove, correspondingly with described two screwed holes be provided with two one ends and have external screw thread, the other end has the cylindrical peg of thin polished rod, and described pin has an externally threaded end end one screwdriver insertion mouth is set.

2, a kind of injection string as claimed in claim 1 reenters guiding device, it is characterized in that: corresponding with the position of described annular groove, be provided with a pair of radial hole in the radial symmetric of described base.

3, a kind of injection string reenters the taking-up instrument of sending into of guiding device, and it is characterized in that: it comprises a tool spindle, an overcoat and some auxiliaries;

Described tool spindle is made up of an apical axis, two axis and a lower shaft of connecting by taper thread successively; Described apical axis is provided with the internal thread interface of a band tapering that is connected with drilling rod, described two axis tops are respectively arranged with a circle flange step, described lower shaft middle part is provided with a radial direction through hole, the bottom radial symmetric of described lower shaft is provided with a pair of blind hole, and the diameter of described apical axis and lower shaft is greater than two axis;

Described overcoat is by forming by upward cover core, the body that is threaded and the core of trapping, and described body outer setting has the guide table of band tapering;

Described auxiliary comprises that two are arranged on the two described axis, and the back-moving spring between two described cover cores and body, two latchings that are arranged on little spring in described two blind holes and two band cup heads, and two passed two described latchings and be connected two end caps on the described blind hole.